Plant biostimulants - Determination of dry matter

This European Standard specifies the procedure for the determination and calculation of the dry matter fraction of plant biostimulants for which the results of performed analysis are to be calculated to the dry matter basis.
This European Standard is also applicable to the blends of fertilizing products where plant biostimulants are the main part of the blend. Otherwise, the Technical Specification for the main part of the blend apply.

Pflanzen-Biostimulanzien - Bestimmung der Trockenmasse

Dieses Dokument legt das Verfahren zur Bestimmung und Berechnung des Trockenmassenanteils von Pflanzen-Biostimulanzien fest, für die die Ergebnisse der durchgeführten Analyse bezogen auf die Trocken¬masse zu berechnen sind.
Dieses Dokument ist für Düngeproduktmischungen anwendbar, die zur PFC 7 gehören und bei denen das in der Mischung enthaltene EU Düngeprodukt Pflanzen-Biostimulans den größten Massenanteil in % in der Mischung ausmacht. Im Fall von gleich großen Anteilen kann der Anwender entweder die vorliegende Norm oder die für den/die anderen Bestandteil(e) anwendbare(n) Norm(en) verwenden.

Biostimulants des végétaux - Détermination de la matière sèche

Le présent document spécifie le mode opératoire pour la détermination et le calcul de la fraction de matière sèche de biostimulants des végétaux pour lesquels les résultats des analyses menées doivent être calculés sur la base de la matière sèche.
Le présent document est applicable aux mélanges de fertilisants appartenant à la catégorie PFC 7, dans lesquels le fertilisant UE biostimulant des végétaux contenu dans le mélange représente le plus fort % en masse du mélange. Dans le cas où les proportions sont égales, l’utilisateur peut appliquer la présente norme ou la ou les normes applicables aux autres produits constituants.

Rastlinski biostimulanti - Določevanje suhe snovi

General Information

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Technical Committee
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4020 - Public enquire (PE) (Adopted Project)
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Due Date
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oSIST prEN 17704:2023
Rastlinski biostimulanti - Določevanje suhe snovi
Plant biostimulants - Determination of dry matter
Pflanzen-Biostimulanzien - Bestimmung der Trockenmasse
Biostimulants des végétaux - Détermination de la matière sèche
Ta slovenski standard je istoveten z: prEN 17704
65.080 Gnojila Fertilizers
oSIST prEN 17704:2023 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN 17704:2023

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oSIST prEN 17704:2023

prEN 17704


March 2023
ICS 65.080 Will supersede CEN/TS 17704:2022
English Version

Plant biostimulants - Determination of dry matter
Biostimulants des végétaux - Détermination de la Pflanzen-Biostimulanzien - Bestimmung der
matière sèche Trockenmasse
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 455.

If this draft becomes a European Standard, CEN members are bound to comply with the CEN/CENELEC Internal Regulations
which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.

This draft European Standard was established by CEN in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC
Management Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.

Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.



CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2023 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 17704:2023 E
worldwide for CEN national Members.

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oSIST prEN 17704:2023
prEN 17704:2023 (E)
Contents Page
European foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Principle . 5
5 Sampling and sample preparation . 5
6 Interferences . 5
7 Reagents . 5
8 Apparatus . 6
9 Procedure . 6
9.1 Procedure A . 6
9.2 Procedure B . 6
9.3 Procedure A and B . 7
10 Quality control . 7
11 Calculation and expression of results . 7
12 Test report . 7
Annex A (informative) Results of the inter-laboratory study . 9
A.1 Inter-laboratory tests . 9
A.2 Statistical results for the determination of dry matter . 9
Annex ZA (informative) Relationship of this European Standard and the essential
requirements of Regulation (EU) 2019/1009 making available on the market of EU
fertilising products aimed to be covered . 12
Bibliography . 13

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oSIST prEN 17704:2023
prEN 17704:2023 (E)
European foreword
This document (prEN 17704:2023) has been prepared by Technical Committee CEN/TC 455 “Plant
biostimulants”, the secretariat of which is held by AFNOR.
This document is currently submitted to the CEN Enquiry.
This document will supersede CEN/TS 17704:2022.
This document has been prepared under a Standardization Request given to CEN by the European
Commission and the European Free Trade Association, and supports essential requirements of EU
Directive(s) / Regulation(s).
For relationship with EU Directive(s) / Regulation(s), see informative Annex ZA, which is an integral part
of this document.

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oSIST prEN 17704:2023
prEN 17704:2023 (E)
This document was prepared by the experts of CEN/TC 455 “Plant biostimulants”. The European
Committee for Standardization (CEN) was requested by the European Commission (EC) to draft
European standards or European standardization deliverables to support the implementation of
Regulation (EU) 2019/1009 of 5 June 2019 laying down rules on the making available on the market of
EU fertilizing products (“FPR” or “Fertilising Products Regulation”).
This standardization request, presented as M/564 and M/564/Amd1, also contributes to the
Communication on “Innovating for Sustainable Growth: A Bio economy for Europe”. The Working Group
4 “Other safety parameters” was created to develop a work programme as part of this request. The
technical committee CEN/TC 455 “Plant biostimulants” was established to carry out the work programme
that will prepare a series of standards. The interest in biostimulants has increased significantly in Europe
as a valuable tool to use in agriculture. Standardization was identified as having an important role in
order to promote the use of biostimulants. The work of CEN/TC 455 seeks to improve the reliability of
the supply chain, thereby boosting the confidence of farmers, industry, and consumers in biostimulants,
and will promote and support commercialisation of the European biostimulant industry. The preparation
of this document is based on a standardization request to CEN by the European Commission and the
European Free Trade Association (Mandate M/564 and M/564/Amd1) concerning the modernization of
methods of analysis of fertilizers within the framework of Regulation (EU) 2019/1009 of the European
Parliament and of the Council.
In case of the analysis of plant biostimulants, water is usually not considered a part of the sample and
results are generally related to dry matter, which can be calculated by determining the dry residue (dry
matter fraction).
WARNING — Persons using this document should be familiar with usual laboratory practice. This
document does not purport to address all of the safety issues, if any, associated with its use. It is the
responsibility of the user to establish appropriate health and safety practices and to ensure compliance
with any national regulatory conditions.
IMPORTANT — It is absolutely essential that tests conducted according to this document are carried out
by suitably trained staff.

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oSIST prEN 17704:2023
prEN 17704:2023 (E)
1 Scope
This document specifies the procedure for the determination and calculation of the dry matter fraction
of plant biostimulants for which the results of performed analysis are to be calculated to the dry matter
This document is applicable to the fertilizing product blends belonging to PFC 7 where the EU fertilising
product plant biostimulant contained in the blend represents the highest % by mass in the blend. In case
of equal shares, the user can apply either this or the standard(s) applicable to the other component
2 Normative references
There are no normative references in this document.
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
dry residue
remaining mass fraction of a sample after a drying process at 105 °C under specified conditions
dry matter fraction
mass fraction of a sample excluding water calculated by the determination of dry residue
4 Principle
The samples are dried to a constant mass in an oven at (105 ± 2) °C. The difference in mass before and
after the drying process is used to determine dry matter. This method applies to solid samples and
samples which become solid during the drying process.
5 Sampling and sample preparation
Sampling and sample preparation are not part of this document. A recommended sampling method and
1 2
sample preparation method are given in EN 17702-1:— and EN 17702-2:— .
6 Interferences
The samples can change during the drying process, e.g. by absorption of carbon dioxide in the case of
alkaline samples, or of oxygen by reducing substances. Volatile compounds evaporating at 105 °C are
expressed as water using this procedure.
7 Reagents
®3 TM
7.1 Sand, CAS 14808-60-7, e.g. AnalaR NORMAPUR purified by acid and calcinated from VWR , or

Under preparation
Under preparation
3 ®
AnalaR NORMAPUR is an example of a suitable product available commercially. This information is given for the
convenience of users of this document and does not constitute an endorsement by CEN of this product.

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oSIST prEN 17704:2023
prEN 17704:2023 (E)
8 Apparatus
8.1 Drying system thermostatically controlled and capable of maintaining temperature of
(105 ± 2) °C.
8.2 Desiccator with an active drying agent such as silica gel.
8.3 Analytical balance capable of weighing to an accuracy of 1 mg or better.
8.4 Evaporating dish or crucible. Temperature tolerant laboratory vessel withstanding at least
110 °C. Suitable materials are metallic, ceramic, borosilicate glass or quartz, porcelain, etc.
9 Procedure
CAUTION — Flammable or explosive gases may be released from some samples in the drying process.
9.1 Procedure A
This procedure is suitable for solid or liquid plant biostimulants. The procedure is not suitable for some
liquid or semi-liquid samples where there is a risk of a cake surface formation or foam formation which
hinders an even drying. For these samples Procedure B (9.2) is preferable.
Place an evaporating dish or crucible (8.4) in the drying system (8.1) set at (105 ± 2) °C for a minimum
of 30 min. After cooling in the desiccator (8.2) to ambient temperature, weigh the dish or crucible (8.4)
to the nearest 1 mg (m ).
Weigh into the evaporating dish or crucible (8.4) (5 to 10) g of solid sample or (10 to 30) g of liquid
sample. The weight should be adjusted to ensure that, if possible, at least 0,2 g of dry residue will remain
after the drying process. Spread the sample to an even depth not exceeding 2 cm. Weigh the loaded dish
or crucible (8.4) to the nearest 1 mg (mb). Place the evaporating dish or crucible (8.4) containing the
sample into the drying system (8.1) set at (105 ± 2) °C until the residue appears dry, typically overnight
but not for more than 20 h. Then follow procedure 9.

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